EEV. A. E. EATON ON RECENT EPHEMERID^ OR MAYFLIES. 271 



Suhimago (dried). — Wings dull light yellowish, less transparent than in S. sulphurea ; 

 the hind wings broadly l)ordered with a liglit greyish cloud along the terminal margin ; 

 the fore wing faintly tinged at the pterostigma with very light red-purple, or purple- 

 madder. Neuratiou at first lutescent, the cross veinlets turning black as in H. sulphurea. 

 Setae lutescent with dark joinings. 



Imago [dried). — Femora not dark-banded. Dorsal segments 1-7 2 or 1-10 6 of the 

 abdomen traversed lengthwise by a dark median stripe, and dai"k-edged halfway across 

 the terminal border on each side of the stripe. A dark stripe on each side descends 

 obliquely from the first dorsal segment, running close behind the hind Aving-roots and the 

 spiracle, and just in front of tlie insertion of the hind leg. — <S . Thorax brown-ochreous or 

 piceo-luteous above, " with a dark violet-brown spot on each side of the prothorax.'' 

 Abdomen bright yellow, with a broad stripe along the middle of the back strongly tinged 

 with purple-madder, darkest above the dorsal vessel and at the joinings for a short distance 

 on each side of that ; in some examples the ordinary curved pale translucent line is 

 visible on each side of the dorsal vessel in segments 2-5, and the other markings comprise 

 a median linear black-purple stri2ie extending from segment 1 to segment 7 or 8, and a 

 purple-madder band extending halfway across the back along the distal margin of each 

 of these segments, and then produced foi-Avards almost at right angles with the margin in 

 a linear stripe to the basal joining of the segment, so as to enclose a light-coloured blotch 

 on each side of the median stripe at the base of the segment. Set;je white or pinkish 

 white, with reddisli joinings. Eore femur brown, tinged with madder-pnrple, chiefly so 

 where in other species the two dark bauds are placed ; fore tibia and tarsus testaceous, 

 or in transmitted light pale amber-yellow, the extremity of the tibia, the tarsal joinings, 

 and the imgues burnt-umber brown ; hinder legs very light testaceous, or else amber- 

 yellow, with an ill-defined jiurplc-brown mark at the end of the fumur, best seen in the 

 intermediate leg and at the lower edge of the limb; their tarsal joinings and ungues 

 purple-brown. Wings vitreous ; the fore wing tinged with light amber-yellow in the 

 I base and pterostigmatic portion of the marginal area, and in the whole of the submarginal 

 area; in the pterostigmatic part of both areas, about halfway between the bulla and 

 the apex, is a faint red-purple cloud ; neuration for the most part pitch-black, the costa, 

 subcosta, and the radius to beyond the middle light pitch-brown or yello\iish brown, the 

 ibulla pitch-black ; the axillary nervures and the proximal extremities of the others very 

 light yellowish brown. 



2 ■ Very similar ; the inner orbit of each eye with a black line below running inwards 

 towards the carina, and a black triangular streak above tapering backwards obliquely. 

 Pronotum with a curved tapering pnrple-black strealc on each side directed obliquely 

 lownwards from the upper posterior angles. The indistinct markings of the legs are 

 Similar to those of the male, but the fore femur is less tinged sometimes with madder- 

 ourple, and the burnt-umber broAvn at the tip of the fore tibia is restricted to the joining. 

 Length of body 9-12; wing, 6 10-12, 2 11-15; seta:', 6 im. 24, subim. 13, ? im. 15- 

 J5, subim. (large example) 19 mm. 



Bub. Middle Europe; Arnhem in Holland, near the railway bridge, 27th July; near 

 Oretschen, Saxony (Rostock). In IVPLach. Mus. are two examples from Herr Rostock, 



